In the concluding section of the Book One of the Treatise, Hume confronts radical scepticism about the standards of correct reasoning. According to the naturalistic interpretations, Hume resolves this scepticism by appealing to some psychological facts. A common criticism of this interpretation is that the alleged naturalistic epistemic norm seems to be merely Hume’s report of his psychology, and it remains unclear why this seemingly mere psychological description can provide a principled reason to overcome his scepticism. In this paper, I (...) will argue that Hume’s discussions of the “indirect passions” and social identity provide a constitutivist ground for the naturalistic epistemic standards in the “Conclusion”: being the object of the indirect passions constitutes what kind of person one is, and being the kind of person (philosopher in Hume’s case) gives non-optional reason to pursue certain kinds of reasoning. (shrink)